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  1. european chemicals agency (echa). (2021). restrictions on the use of toluene diisocyanates. https://echa.europa.eu
  2. u.s. consumer product safety commission (cpsc). (2020). safety standard for toy safety. https://www.cpsc.gov
  3. gb 6675-2014, national standard of the people’s republic of china for toy safety.
  4. iso 8124-1:2018, safety of toys – part 1: mechanical and physical properties.
  5. zhang, l., et al. (2022). recent advances in polyurethane foams based on tdi-80 for infant products. journal of applied polymer science, 139(2), 51845.

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